Merge e521dba4400cefab9549d4152b5dc64711c20a29 into d9e5cdf9c6f9c1643be6e081516469c71645d93d

Bumps [github.com/goccy/go-yaml](https://github.com/goccy/go-yaml) from 1.19.0 to 1.19.1.
- [Release notes](https://github.com/goccy/go-yaml/releases)
- [Changelog](https://github.com/goccy/go-yaml/blob/master/CHANGELOG.md)
- [Commits](https://github.com/goccy/go-yaml/compare/v1.19.0...v1.19.1)

---
updated-dependencies:
- dependency-name: github.com/goccy/go-yaml
  dependency-version: 1.19.1
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

binding/form_mapping.go

@@ -5,6 +5,7 @@
 package binding
 
 import (
+	"encoding"
 	"errors"
 	"fmt"
 	"maps"
@@ -137,6 +138,8 @@ func mapping(value reflect.Value, field reflect.StructField, setter setter, tag
 type setOptions struct {
 	isDefaultExists bool
 	defaultValue    string
+	// parser specifies what interface to use for reading the request & default values (e.g. `encoding.TextUnmarshaler`)
+	parser string
 }
 
 func tryToSetValue(value reflect.Value, field reflect.StructField, setter setter, tag string) (bool, error) {
@@ -168,6 +171,8 @@ func tryToSetValue(value reflect.Value, field reflect.StructField, setter setter
 					setOpt.defaultValue = strings.ReplaceAll(v, ";", ",")
 				}
 			}
+		} else if k, v = head(opt, "="); k == "parser" {
+			setOpt.parser = v
 		}
 	}
 
@@ -191,6 +196,20 @@ func trySetCustom(val string, value reflect.Value) (isSet bool, err error) {
 	return false, nil
 }
 
+// trySetUsingParser tries to set a custom type value based on the presence of the "parser" tag on the field.
+// If the parser tag does not exist or does not match any of the supported parsers, gin will skip over this.
+func trySetUsingParser(val string, value reflect.Value, parser string) (isSet bool, err error) {
+	switch parser {
+	case "encoding.TextUnmarshaler":
+		v, ok := value.Addr().Interface().(encoding.TextUnmarshaler)
+		if !ok {
+			return false, nil
+		}
+		return true, v.UnmarshalText([]byte(val))
+	}
+	return false, nil
+}
+
 func trySplit(vs []string, field reflect.StructField) (newVs []string, err error) {
 	cfTag := field.Tag.Get("collection_format")
 	if cfTag == "" || cfTag == "multi" {
@@ -208,7 +227,7 @@ func trySplit(vs []string, field reflect.StructField) (newVs []string, err error
 	case "pipes":
 		sep = "|"
 	default:
-		return vs, fmt.Errorf("%s is not supported in the collection_format. (csv, ssv, pipes)", cfTag)
+		return vs, fmt.Errorf("%s is not supported in the collection_format. (multi, csv, ssv, tsv, pipes)", cfTag)
 	}
 
 	totalLength := 0
@@ -244,7 +263,9 @@ func setByForm(value reflect.Value, field reflect.StructField, form map[string][
 			}
 		}
 
-		if ok, err = trySetCustom(vs[0], value); ok {
+		if ok, err = trySetUsingParser(vs[0], value, opt.parser); ok {
+			return ok, err
+		} else if ok, err = trySetCustom(vs[0], value); ok {
 			return ok, err
 		}
 
@@ -252,7 +273,7 @@ func setByForm(value reflect.Value, field reflect.StructField, form map[string][
 			return false, err
 		}
 
-		return true, setSlice(vs, value, field)
+		return true, setSlice(vs, value, field, opt)
 	case reflect.Array:
 		if len(vs) == 0 {
 			if !opt.isDefaultExists {
@@ -267,7 +288,9 @@ func setByForm(value reflect.Value, field reflect.StructField, form map[string][
 			}
 		}
 
-		if ok, err = trySetCustom(vs[0], value); ok {
+		if ok, err = trySetUsingParser(vs[0], value, opt.parser); ok {
+			return ok, err
+		} else if ok, err = trySetCustom(vs[0], value); ok {
 			return ok, err
 		}
 
@@ -279,27 +302,32 @@ func setByForm(value reflect.Value, field reflect.StructField, form map[string][
 			return false, fmt.Errorf("%q is not valid value for %s", vs, value.Type().String())
 		}
 
-		return true, setArray(vs, value, field)
+		return true, setArray(vs, value, field, opt)
 	default:
 		var val string
-		if !ok {
+		if !ok || len(vs) == 0 || (len(vs) > 0 && vs[0] == "") {
 			val = opt.defaultValue
+		} else if len(vs) > 0 {
+			val = vs[0]
 		}
 
-		if len(vs) > 0 {
-			val = vs[0]
-			if val == "" {
-				val = opt.defaultValue
-			}
-		}
-		if ok, err := trySetCustom(val, value); ok {
+		if ok, err = trySetUsingParser(val, value, opt.parser); ok {
+			return ok, err
+		} else if ok, err = trySetCustom(val, value); ok {
 			return ok, err
 		}
-		return true, setWithProperType(val, value, field)
+		return true, setWithProperType(val, value, field, opt)
 	}
 }
 
-func setWithProperType(val string, value reflect.Value, field reflect.StructField) error {
+func setWithProperType(val string, value reflect.Value, field reflect.StructField, opt setOptions) error {
+	// this if-check is required for parsing nested types like []MyId, where MyId is [12]byte
+	if ok, err := trySetUsingParser(val, value, opt.parser); ok {
+		return err
+	} else if ok, err = trySetCustom(val, value); ok {
+		return err
+	}
+
 	// If it is a string type, no spaces are removed, and the user data is not modified here
 	if value.Kind() != reflect.String {
 		val = strings.TrimSpace(val)
@@ -352,7 +380,7 @@ func setWithProperType(val string, value reflect.Value, field reflect.StructFiel
 		if !value.Elem().IsValid() {
 			value.Set(reflect.New(value.Type().Elem()))
 		}
-		return setWithProperType(val, value.Elem(), field)
+		return setWithProperType(val, value.Elem(), field, opt)
 	default:
 		return errUnknownType
 	}
@@ -459,9 +487,9 @@ func setTimeField(val string, structField reflect.StructField, value reflect.Val
 	return nil
 }
 
-func setArray(vals []string, value reflect.Value, field reflect.StructField) error {
+func setArray(vals []string, value reflect.Value, field reflect.StructField, opt setOptions) error {
 	for i, s := range vals {
-		err := setWithProperType(s, value.Index(i), field)
+		err := setWithProperType(s, value.Index(i), field, opt)
 		if err != nil {
 			return err
 		}
@@ -469,9 +497,9 @@ func setArray(vals []string, value reflect.Value, field reflect.StructField) err
 	return nil
 }
 
-func setSlice(vals []string, value reflect.Value, field reflect.StructField) error {
+func setSlice(vals []string, value reflect.Value, field reflect.StructField, opt setOptions) error {
 	slice := reflect.MakeSlice(value.Type(), len(vals), len(vals))
-	err := setArray(vals, slice, field)
+	err := setArray(vals, slice, field, opt)
 	if err != nil {
 		return err
 	}

binding/form_mapping_test.go

@@ -5,6 +5,7 @@
 package binding
 
 import (
+	"encoding"
 	"encoding/hex"
 	"errors"
 	"mime/multipart"
@@ -524,6 +525,16 @@ func TestMappingCustomUnmarshalParamHexWithURITag(t *testing.T) {
 	assert.EqualValues(t, 245, s.Foo)
 }
 
+func TestMappingCustomUnmarshalParamHexDefault(t *testing.T) {
+	var s struct {
+		Foo customUnmarshalParamHex `form:"foo,default=f5"`
+	}
+	err := mappingByPtr(&s, formSource{"foo": {}}, "form")
+	require.NoError(t, err)
+
+	assert.EqualValues(t, 0xf5, s.Foo)
+}
+
 type customUnmarshalParamType struct {
 	Protocol string
 	Path     string
@@ -624,6 +635,33 @@ func TestMappingCustomSliceForm(t *testing.T) {
 	assert.Equal(t, "foo", s.FileData[1])
 }
 
+func TestMappingCustomSliceStopsWhenError(t *testing.T) {
+	var s struct {
+		FileData customPath `form:"path"`
+	}
+	err := mappingByPtr(&s, formSource{"path": {"invalid"}}, "form")
+	require.ErrorContains(t, err, "invalid format")
+	require.Empty(t, s.FileData)
+}
+
+func TestMappingCustomSliceOfSliceUri(t *testing.T) {
+	var s struct {
+		FileData []customPath `uri:"path" collection_format:"csv"`
+	}
+	err := mappingByPtr(&s, formSource{"path": {"bar/foo,bar/foo/spam"}}, "uri")
+	require.NoError(t, err)
+	assert.Equal(t, []customPath{{"bar", "foo"}, {"bar", "foo", "spam"}}, s.FileData)
+}
+
+func TestMappingCustomSliceOfSliceForm(t *testing.T) {
+	var s struct {
+		FileData []customPath `form:"path" collection_format:"csv"`
+	}
+	err := mappingByPtr(&s, formSource{"path": {"bar/foo,bar/foo/spam"}}, "form")
+	require.NoError(t, err)
+	assert.Equal(t, []customPath{{"bar", "foo"}, {"bar", "foo", "spam"}}, s.FileData)
+}
+
 type objectID [12]byte
 
 func (o *objectID) UnmarshalParam(param string) error {
@@ -675,6 +713,358 @@ func TestMappingCustomArrayForm(t *testing.T) {
 	assert.Equal(t, expected, s.FileData)
 }
 
+func TestMappingCustomArrayOfArrayUri(t *testing.T) {
+	id1, _ := convertTo(`664a062ac74a8ad104e0e80e`)
+	id2, _ := convertTo(`664a062ac74a8ad104e0e80f`)
+
+	var s struct {
+		FileData []objectID `uri:"ids" collection_format:"csv"`
+	}
+	err := mappingByPtr(&s, formSource{"ids": {`664a062ac74a8ad104e0e80e,664a062ac74a8ad104e0e80f`}}, "uri")
+	require.NoError(t, err)
+	assert.Equal(t, []objectID{id1, id2}, s.FileData)
+}
+
+func TestMappingCustomArrayOfArrayForm(t *testing.T) {
+	id1, _ := convertTo(`664a062ac74a8ad104e0e80e`)
+	id2, _ := convertTo(`664a062ac74a8ad104e0e80f`)
+
+	var s struct {
+		FileData []objectID `form:"ids" collection_format:"csv"`
+	}
+	err := mappingByPtr(&s, formSource{"ids": {`664a062ac74a8ad104e0e80e,664a062ac74a8ad104e0e80f`}}, "form")
+	require.NoError(t, err)
+	assert.Equal(t, []objectID{id1, id2}, s.FileData)
+}
+
+// ====  TextUnmarshaler tests START ====
+
+type customUnmarshalTextHex int
+
+func (f *customUnmarshalTextHex) UnmarshalText(text []byte) error {
+	v, err := strconv.ParseInt(string(text), 16, 64)
+	if err != nil {
+		return err
+	}
+	*f = customUnmarshalTextHex(v)
+	return nil
+}
+
+// verify type implements TextUnmarshaler
+var _ encoding.TextUnmarshaler = (*customUnmarshalTextHex)(nil)
+
+func TestMappingCustomUnmarshalTextHexUri(t *testing.T) {
+	var s struct {
+		Field customUnmarshalTextHex `uri:"field,parser=encoding.TextUnmarshaler"`
+	}
+	err := mappingByPtr(&s, formSource{"field": {`f5`}}, "uri")
+	require.NoError(t, err)
+	assert.EqualValues(t, 245, s.Field)
+}
+
+func TestMappingCustomUnmarshalTextHexForm(t *testing.T) {
+	var s struct {
+		Field customUnmarshalTextHex `form:"field,parser=encoding.TextUnmarshaler"`
+	}
+	err := mappingByPtr(&s, formSource{"field": {`f5`}}, "form")
+	require.NoError(t, err)
+	assert.EqualValues(t, 245, s.Field)
+}
+
+func TestMappingCustomUnmarshalTextHexDefault(t *testing.T) {
+	var s struct {
+		Field customUnmarshalTextHex `form:"field,default=f5,parser=encoding.TextUnmarshaler"`
+	}
+	err := mappingByPtr(&s, formSource{"field1": {}}, "form")
+	require.NoError(t, err)
+	assert.EqualValues(t, 0xf5, s.Field)
+}
+
+type customUnmarshalTextType struct {
+	Protocol string
+	Path     string
+	Name     string
+}
+
+func (f *customUnmarshalTextType) UnmarshalText(text []byte) error {
+	parts := strings.Split(string(text), ":")
+	if len(parts) != 3 {
+		return errors.New("invalid format")
+	}
+	f.Protocol = parts[0]
+	f.Path = parts[1]
+	f.Name = parts[2]
+	return nil
+}
+
+var _ encoding.TextUnmarshaler = (*customUnmarshalTextType)(nil)
+
+func TestMappingCustomStructTypeUnmarshalTextForm(t *testing.T) {
+	var s struct {
+		FileData customUnmarshalTextType `form:"data,parser=encoding.TextUnmarshaler"`
+	}
+	err := mappingByPtr(&s, formSource{"data": {`file:/foo:happiness`}}, "form")
+	require.NoError(t, err)
+
+	assert.Equal(t, "file", s.FileData.Protocol)
+	assert.Equal(t, "/foo", s.FileData.Path)
+	assert.Equal(t, "happiness", s.FileData.Name)
+}
+
+func TestMappingCustomStructTypeUnmarshalTextUri(t *testing.T) {
+	var s struct {
+		FileData customUnmarshalTextType `uri:"data,parser=encoding.TextUnmarshaler"`
+	}
+	err := mappingByPtr(&s, formSource{"data": {`file:/foo:happiness`}}, "uri")
+	require.NoError(t, err)
+
+	assert.Equal(t, "file", s.FileData.Protocol)
+	assert.Equal(t, "/foo", s.FileData.Path)
+	assert.Equal(t, "happiness", s.FileData.Name)
+}
+
+func TestMappingCustomPointerStructTypeUnmarshalTextForm(t *testing.T) {
+	var s struct {
+		FileData *customUnmarshalTextType `form:"data,parser=encoding.TextUnmarshaler"`
+	}
+	err := mappingByPtr(&s, formSource{"data": {`file:/foo:happiness`}}, "form")
+	require.NoError(t, err)
+
+	assert.Equal(t, "file", s.FileData.Protocol)
+	assert.Equal(t, "/foo", s.FileData.Path)
+	assert.Equal(t, "happiness", s.FileData.Name)
+}
+
+func TestMappingCustomPointerStructTypeUnmarshalTextUri(t *testing.T) {
+	var s struct {
+		FileData *customUnmarshalTextType `uri:"data,parser=encoding.TextUnmarshaler"`
+	}
+	err := mappingByPtr(&s, formSource{"data": {`file:/foo:happiness`}}, "uri")
+	require.NoError(t, err)
+
+	assert.Equal(t, "file", s.FileData.Protocol)
+	assert.Equal(t, "/foo", s.FileData.Path)
+	assert.Equal(t, "happiness", s.FileData.Name)
+}
+
+type customPathUnmarshalText []string
+
+func (p *customPathUnmarshalText) UnmarshalText(text []byte) error {
+	elems := strings.Split(string(text), "/")
+	n := len(elems)
+	if n < 2 {
+		return errors.New("invalid format")
+	}
+
+	*p = elems
+	return nil
+}
+
+var _ encoding.TextUnmarshaler = (*customPathUnmarshalText)(nil)
+
+func TestMappingCustomSliceUnmarshalTextUri(t *testing.T) {
+	var s struct {
+		FileData customPathUnmarshalText `uri:"path,parser=encoding.TextUnmarshaler"`
+	}
+	err := mappingByPtr(&s, formSource{"path": {`bar/foo`}}, "uri")
+	require.NoError(t, err)
+
+	assert.Equal(t, "bar", s.FileData[0])
+	assert.Equal(t, "foo", s.FileData[1])
+}
+
+func TestMappingCustomSliceUnmarshalTextForm(t *testing.T) {
+	var s struct {
+		FileData customPathUnmarshalText `form:"path,parser=encoding.TextUnmarshaler"`
+	}
+	err := mappingByPtr(&s, formSource{"path": {`bar/foo`}}, "form")
+	require.NoError(t, err)
+
+	assert.Equal(t, "bar", s.FileData[0])
+	assert.Equal(t, "foo", s.FileData[1])
+}
+
+func TestMappingCustomSliceUnmarshalTextStopsWhenError(t *testing.T) {
+	var s struct {
+		FileData customPathUnmarshalText `form:"path,parser=encoding.TextUnmarshaler"`
+	}
+	err := mappingByPtr(&s, formSource{"path": {"invalid"}}, "form")
+	require.ErrorContains(t, err, "invalid format")
+	require.Empty(t, s.FileData)
+}
+
+func TestMappingCustomSliceOfSliceUnmarshalTextUri(t *testing.T) {
+	var s struct {
+		FileData []customPathUnmarshalText `uri:"path,parser=encoding.TextUnmarshaler" collection_format:"csv"`
+	}
+	err := mappingByPtr(&s, formSource{"path": {"bar/foo,bar/foo/spam"}}, "uri")
+	require.NoError(t, err)
+	assert.Equal(t, []customPathUnmarshalText{{"bar", "foo"}, {"bar", "foo", "spam"}}, s.FileData)
+}
+
+func TestMappingCustomSliceOfSliceUnmarshalTextForm(t *testing.T) {
+	var s struct {
+		FileData []customPathUnmarshalText `form:"path,parser=encoding.TextUnmarshaler" collection_format:"csv"`
+	}
+	err := mappingByPtr(&s, formSource{"path": {"bar/foo,bar/foo/spam"}}, "form")
+	require.NoError(t, err)
+	assert.Equal(t, []customPathUnmarshalText{{"bar", "foo"}, {"bar", "foo", "spam"}}, s.FileData)
+}
+
+func TestMappingCustomSliceOfSliceUnmarshalTextDefault(t *testing.T) {
+	var s struct {
+		FileData []customPathUnmarshalText `form:"path,default=bar/foo;bar/foo/spam,parser=encoding.TextUnmarshaler" collection_format:"csv"`
+	}
+	err := mappingByPtr(&s, formSource{"path": {}}, "form")
+	require.NoError(t, err)
+	assert.Equal(t, []customPathUnmarshalText{{"bar", "foo"}, {"bar", "foo", "spam"}}, s.FileData)
+}
+
+type objectIDUnmarshalText [12]byte
+
+func (o *objectIDUnmarshalText) UnmarshalText(text []byte) error {
+	oid, err := convertToOidUnmarshalText(string(text))
+	if err != nil {
+		return err
+	}
+
+	*o = oid
+	return nil
+}
+
+func convertToOidUnmarshalText(s string) (objectIDUnmarshalText, error) {
+	oid, err := convertTo(s)
+	return objectIDUnmarshalText(oid), err
+}
+
+var _ encoding.TextUnmarshaler = (*objectIDUnmarshalText)(nil)
+
+func TestMappingCustomArrayUnmarshalTextUri(t *testing.T) {
+	var s struct {
+		FileData objectIDUnmarshalText `uri:"id,parser=encoding.TextUnmarshaler"`
+	}
+	val := `664a062ac74a8ad104e0e80f`
+	err := mappingByPtr(&s, formSource{"id": {val}}, "uri")
+	require.NoError(t, err)
+
+	expected, _ := convertToOidUnmarshalText(val)
+	assert.Equal(t, expected, s.FileData)
+}
+
+func TestMappingCustomArrayUnmarshalTextForm(t *testing.T) {
+	var s struct {
+		FileData objectIDUnmarshalText `form:"id,parser=encoding.TextUnmarshaler"`
+	}
+	val := `664a062ac74a8ad104e0e80f`
+	err := mappingByPtr(&s, formSource{"id": {val}}, "form")
+	require.NoError(t, err)
+
+	expected, _ := convertToOidUnmarshalText(val)
+	assert.Equal(t, expected, s.FileData)
+}
+
+func TestMappingCustomArrayOfArrayUnmarshalTextUri(t *testing.T) {
+	id1, _ := convertToOidUnmarshalText(`664a062ac74a8ad104e0e80e`)
+	id2, _ := convertToOidUnmarshalText(`664a062ac74a8ad104e0e80f`)
+
+	var s struct {
+		FileData []objectIDUnmarshalText `uri:"ids,parser=encoding.TextUnmarshaler" collection_format:"csv"`
+	}
+	err := mappingByPtr(&s, formSource{"ids": {`664a062ac74a8ad104e0e80e,664a062ac74a8ad104e0e80f`}}, "uri")
+	require.NoError(t, err)
+	assert.Equal(t, []objectIDUnmarshalText{id1, id2}, s.FileData)
+}
+
+func TestMappingCustomArrayOfArrayUnmarshalTextForm(t *testing.T) {
+	id1, _ := convertToOidUnmarshalText(`664a062ac74a8ad104e0e80e`)
+	id2, _ := convertToOidUnmarshalText(`664a062ac74a8ad104e0e80f`)
+
+	var s struct {
+		FileData []objectIDUnmarshalText `form:"ids,parser=encoding.TextUnmarshaler" collection_format:"csv"`
+	}
+	err := mappingByPtr(&s, formSource{"ids": {`664a062ac74a8ad104e0e80e,664a062ac74a8ad104e0e80f`}}, "form")
+	require.NoError(t, err)
+	assert.Equal(t, []objectIDUnmarshalText{id1, id2}, s.FileData)
+}
+
+func TestMappingCustomArrayOfArrayUnmarshalTextDefault(t *testing.T) {
+	id1, _ := convertToOidUnmarshalText(`664a062ac74a8ad104e0e80e`)
+	id2, _ := convertToOidUnmarshalText(`664a062ac74a8ad104e0e80f`)
+
+	var s struct {
+		FileData []objectIDUnmarshalText `form:"ids,default=664a062ac74a8ad104e0e80e;664a062ac74a8ad104e0e80f,parser=encoding.TextUnmarshaler" collection_format:"csv"`
+	}
+	err := mappingByPtr(&s, formSource{"ids": {}}, "form")
+	require.NoError(t, err)
+	assert.Equal(t, []objectIDUnmarshalText{id1, id2}, s.FileData)
+}
+
+// If someone specifies parser=TextUnmarshaler and it's not defined for the type, gin should revert to using its default
+// binding logic.
+func TestMappingUsingBindUnmarshalerAndTextUnmarshalerWhenOnlyBindUnmarshalerDefined(t *testing.T) {
+	var s struct {
+		Hex                customUnmarshalParamHex `form:"hex"`
+		HexByUnmarshalText customUnmarshalParamHex `form:"hex2,parser=encoding.TextUnmarshaler"`
+	}
+	err := mappingByPtr(&s, formSource{
+		"hex":  {`f5`},
+		"hex2": {`f5`},
+	}, "form")
+	require.NoError(t, err)
+
+	assert.EqualValues(t, 0xf5, s.Hex)
+	assert.EqualValues(t, 0xf5, s.HexByUnmarshalText) // reverts to BindUnmarshaler binding
+}
+
+// If someone does not specify parser=TextUnmarshaler even when it's defined for the type, gin should ignore the
+// UnmarshalText logic and continue using its default binding logic. (This ensures gin does not break backwards
+// compatibility)
+func TestMappingUsingBindUnmarshalerAndTextUnmarshalerWhenOnlyTextUnmarshalerDefined(t *testing.T) {
+	var s struct {
+		Hex                customUnmarshalTextHex `form:"hex"`
+		HexByUnmarshalText customUnmarshalTextHex `form:"hex2,parser=encoding.TextUnmarshaler"`
+	}
+	err := mappingByPtr(&s, formSource{
+		"hex":  {`11`},
+		"hex2": {`11`},
+	}, "form")
+	require.NoError(t, err)
+
+	assert.EqualValues(t, 11, s.Hex)                  // this is using default int binding, not our custom hex binding. 0x11 should be 17 in decimal
+	assert.EqualValues(t, 0x11, s.HexByUnmarshalText) // correct expected value for normal hex binding
+}
+
+type customHexUnmarshalParamAndUnmarshalText int
+
+func (f *customHexUnmarshalParamAndUnmarshalText) UnmarshalParam(param string) error {
+	return errors.New("should not be called in unit test if parser tag present")
+}
+
+func (f *customHexUnmarshalParamAndUnmarshalText) UnmarshalText(text []byte) error {
+	v, err := strconv.ParseInt(string(text), 16, 64)
+	if err != nil {
+		return err
+	}
+	*f = customHexUnmarshalParamAndUnmarshalText(v)
+	return nil
+}
+
+// If a type has both UnmarshalParam and UnmarshalText methods defined, but the parser tag is set to TextUnmarshaler,
+// then only the UnmarshalText method should be invoked.
+func TestMappingUsingTextUnmarshalerWhenBindUnmarshalerAlsoDefined(t *testing.T) {
+	var s struct {
+		Hex customHexUnmarshalParamAndUnmarshalText `form:"hex,parser=encoding.TextUnmarshaler"`
+	}
+	err := mappingByPtr(&s, formSource{
+		"hex": {`f5`},
+	}, "form")
+	require.NoError(t, err)
+
+	assert.EqualValues(t, 0xf5, s.Hex)
+}
+
+// ====  TextUnmarshaler tests END ====
+
 func TestMappingEmptyValues(t *testing.T) {
 	t.Run("slice with default", func(t *testing.T) {
 		var s struct {

context.go

@@ -386,6 +386,11 @@ func (c *Context) GetDuration(key any) time.Duration {
 	return getTyped[time.Duration](c, key)
 }
 
+// GetError returns the value associated with the key as an error.
+func (c *Context) GetError(key any) error {
+	return getTyped[error](c, key)
+}
+
 // GetIntSlice returns the value associated with the key as a slice of integers.
 func (c *Context) GetIntSlice(key any) []int {
 	return getTyped[[]int](c, key)
@@ -451,6 +456,11 @@ func (c *Context) GetStringSlice(key any) []string {
 	return getTyped[[]string](c, key)
 }
 
+// GetErrorSlice returns the value associated with the key as a slice of errors.
+func (c *Context) GetErrorSlice(key any) []error {
+	return getTyped[[]error](c, key)
+}
+
 // GetStringMap returns the value associated with the key as a map of interfaces.
 func (c *Context) GetStringMap(key any) map[string]any {
 	return getTyped[map[string]any](c, key)
@@ -1212,6 +1222,12 @@ func (c *Context) XML(code int, obj any) {
 	c.Render(code, render.XML{Data: obj})
 }
 
+// PDF writes the given PDF binary data into the response body.
+// It also sets the Content-Type as "application/pdf".
+func (c *Context) PDF(code int, data []byte) {
+	c.Render(code, render.PDF{Data: data})
+}
+
 // YAML serializes the given struct as YAML into the response body.
 func (c *Context) YAML(code int, obj any) {
 	c.Render(code, render.YAML{Data: obj})

context_test.go

@@ -516,6 +516,14 @@ func TestContextGetDuration(t *testing.T) {
 	assert.Equal(t, time.Second, c.GetDuration("duration"))
 }
 
+func TestContextGetError(t *testing.T) {
+	c, _ := CreateTestContext(httptest.NewRecorder())
+	key := "error"
+	value := errors.New("test error")
+	c.Set(key, value)
+	assert.Equal(t, value, c.GetError(key))
+}
+
 func TestContextGetIntSlice(t *testing.T) {
 	c, _ := CreateTestContext(httptest.NewRecorder())
 	key := "int-slice"
@@ -618,6 +626,14 @@ func TestContextGetStringSlice(t *testing.T) {
 	assert.Equal(t, []string{"foo"}, c.GetStringSlice("slice"))
 }
 
+func TestContextGetErrorSlice(t *testing.T) {
+	c, _ := CreateTestContext(httptest.NewRecorder())
+	key := "error-slice"
+	value := []error{errors.New("error1"), errors.New("error2")}
+	c.Set(key, value)
+	assert.Equal(t, value, c.GetErrorSlice(key))
+}
+
 func TestContextGetStringMap(t *testing.T) {
 	c, _ := CreateTestContext(httptest.NewRecorder())
 	m := make(map[string]any)

docs/doc.md

@@ -911,7 +911,7 @@ curl -X POST http://localhost:8080/person
 
 NOTE: For default [collection values](#collection-format-for-arrays), the following rules apply:
 - Since commas are used to delimit tag options, they are not supported within a default value and will result in undefined behavior
-- For the collection formats "multi" and "csv", a semicolon should be used in place of a comma to delimited default values
+- For the collection formats "multi" and "csv", a semicolon should be used in place of a comma to delimit default values
 - Since semicolons are used to delimit default values for "multi" and "csv", they are not supported within a default value for "multi" and "csv"
 
 
@@ -1009,12 +1009,68 @@ curl -v localhost:8088/thinkerou/not-uuid
 
 ### Bind custom unmarshaler
 
+To override gin's default binding logic, define a function on your type that satisfies the `encoding.TextUnmarshaler` interface from the Golang standard library. Then specify `parser=encoding.TextUnmarshaler` in the `uri`/`form` tag of the field being bound.
+
 ```go
 package main
 
 import (
-  "github.com/gin-gonic/gin"
+  "encoding"
   "strings"
+
+  "github.com/gin-gonic/gin"
+)
+
+type Birthday string
+
+func (b *Birthday) UnmarshalText(text []byte) error {
+  *b = Birthday(strings.Replace(string(text), "-", "/", -1))
+  return nil
+}
+
+var _ encoding.TextUnmarshaler = (*Birthday)(nil) //assert Birthday implements encoding.TextUnmarshaler
+
+func main() {
+  route := gin.Default()
+  var request struct {
+    Birthday         Birthday   `form:"birthday,parser=encoding.TextUnmarshaler"`
+    Birthdays        []Birthday `form:"birthdays,parser=encoding.TextUnmarshaler" collection_format:"csv"`
+    BirthdaysDefault []Birthday `form:"birthdaysDef,default=2020-09-01;2020-09-02,parser=encoding.TextUnmarshaler" collection_format:"csv"`
+  }
+  route.GET("/test", func(ctx *gin.Context) {
+    _ = ctx.BindQuery(&request)
+    ctx.JSON(200, request)
+  })
+  _ = route.Run(":8088")
+}
+```
+
+Test it with:
+
+```sh
+curl 'localhost:8088/test?birthday=2000-01-01&birthdays=2000-01-01,2000-01-02'
+```
+Result
+```sh
+{"Birthday":"2000/01/01","Birthdays":["2000/01/01","2000/01/02"],"BirthdaysDefault":["2020/09/01","2020/09/02"]}
+```
+
+Note:
+- If `parser=encoding.TextUnmarshaler` is specified for a type that does **not** implement `encoding.TextUnmarshaler`, gin will ignore it and proceed with its default binding logic.
+- If `parser=encoding.TextUnmarshaler` is specified for a type and that type's implementation of `encoding.TextUnmarshaler` returns an error, gin will stop binding and return the error to the client.
+
+---
+
+If a type already implements `encoding.TextUnmarshaler` but you want to customize how gin binds the type differently (eg to change what error message is returned), you can implement the dedicated `BindUnmarshaler` interface provided by gin instead.
+
+```go
+package main
+
+import (
+  "strings"
+
+  "github.com/gin-gonic/gin"
+  "github.com/gin-gonic/gin/binding"
 )
 
 type Birthday string
@@ -1024,29 +1080,37 @@ func (b *Birthday) UnmarshalParam(param string) error {
   return nil
 }
 
+var _ binding.BindUnmarshaler = (*Birthday)(nil) //assert Birthday implements binding.BindUnmarshaler
+
 func main() {
   route := gin.Default()
   var request struct {
-    Birthday Birthday `form:"birthday"`
+    Birthday         Birthday   `form:"birthday"`
+    Birthdays        []Birthday `form:"birthdays" collection_format:"csv"`
+    BirthdaysDefault []Birthday `form:"birthdaysDef,default=2020-09-01;2020-09-02" collection_format:"csv"`
   }
   route.GET("/test", func(ctx *gin.Context) {
     _ = ctx.BindQuery(&request)
-    ctx.JSON(200, request.Birthday)
+    ctx.JSON(200, request)
   })
-  route.Run(":8088")
+  _ = route.Run(":8088")
 }
 ```
 
 Test it with:
 
 ```sh
-curl 'localhost:8088/test?birthday=2000-01-01'
+curl 'localhost:8088/test?birthday=2000-01-01&birthdays=2000-01-01,2000-01-02'
 ```
 Result
 ```sh
-"2000/01/01"
+{"Birthday":"2000/01/01","Birthdays":["2000/01/01","2000/01/02"],"BirthdaysDefault":["2020/09/01","2020/09/02"]}
 ```
 
+Note:
+- If a type implements both `encoding.TextUnmarshaler` and `BindUnmarshaler`, gin will use `BindUnmarshaler` by default unless you specify `parser=encoding.TextUnmarshaler` in the binding tag.
+- If a type returns an error from its implementation of `BindUnmarshaler`, gin will stop binding and return the error to the client.
+
 ### Bind Header
 
 ```go

go.mod

@@ -7,7 +7,7 @@ require (
 	github.com/gin-contrib/sse v1.1.0
 	github.com/go-playground/validator/v10 v10.28.0
 	github.com/goccy/go-json v0.10.2
-	github.com/goccy/go-yaml v1.19.0
+	github.com/goccy/go-yaml v1.19.1
 	github.com/json-iterator/go v1.1.12
 	github.com/mattn/go-isatty v0.0.20
 	github.com/modern-go/reflect2 v1.0.2

go.sum

@@ -24,8 +24,8 @@ github.com/go-playground/validator/v10 v10.28.0 h1:Q7ibns33JjyW48gHkuFT91qX48KG0
 github.com/go-playground/validator/v10 v10.28.0/go.mod h1:GoI6I1SjPBh9p7ykNE/yj3fFYbyDOpwMn5KXd+m2hUU=
 github.com/goccy/go-json v0.10.2 h1:CrxCmQqYDkv1z7lO7Wbh2HN93uovUHgrECaO5ZrCXAU=
 github.com/goccy/go-json v0.10.2/go.mod h1:6MelG93GURQebXPDq3khkgXZkazVtN9CRI+MGFi0w8I=
-github.com/goccy/go-yaml v1.19.0 h1:EmkZ9RIsX+Uq4DYFowegAuJo8+xdX3T/2dwNPXbxEYE=
-github.com/goccy/go-yaml v1.19.0/go.mod h1:XBurs7gK8ATbW4ZPGKgcbrY1Br56PdM69F7LkFRi1kA=
+github.com/goccy/go-yaml v1.19.1 h1:3rG3+v8pkhRqoQ/88NYNMHYVGYztCOCIZ7UQhu7H+NE=
+github.com/goccy/go-yaml v1.19.1/go.mod h1:XBurs7gK8ATbW4ZPGKgcbrY1Br56PdM69F7LkFRi1kA=
 github.com/google/go-cmp v0.7.0 h1:wk8382ETsv4JYUZwIsn6YpYiWiBsYLSJiTsyBybVuN8=
 github.com/google/go-cmp v0.7.0/go.mod h1:pXiqmnSA92OHEEa9HXL2W4E7lf9JzCmGVUdgjX3N/iU=
 github.com/google/gofuzz v1.0.0/go.mod h1:dBl0BpW6vV/+mYPU4Po3pmUjxk6FQPldtuIdl/M65Eg=

render/pdf.go

@@ -0,0 +1,26 @@
+// Copyright 2026 Gin Core Team. All rights reserved.
+// Use of this source code is governed by a MIT style
+// license that can be found in the LICENSE file.
+
+package render
+
+import "net/http"
+
+// PDF contains the given PDF binary data.
+type PDF struct {
+	Data []byte
+}
+
+var pdfContentType = []string{"application/pdf"}
+
+// Render (PDF) writes PDF data with custom ContentType.
+func (r PDF) Render(w http.ResponseWriter) error {
+	r.WriteContentType(w)
+	_, err := w.Write(r.Data)
+	return err
+}
+
+// WriteContentType (PDF) writes PDF ContentType for response.
+func (r PDF) WriteContentType(w http.ResponseWriter) {
+	writeContentType(w, pdfContentType)
+}

render/render.go

@@ -31,6 +31,7 @@ var (
 	_ Render     = (*AsciiJSON)(nil)
 	_ Render     = (*ProtoBuf)(nil)
 	_ Render     = (*TOML)(nil)
+	_ Render     = (*PDF)(nil)
 )
 
 func writeContentType(w http.ResponseWriter, value []string) {

render/render_test.go

@@ -375,6 +375,22 @@ func TestRenderXML(t *testing.T) {
 	assert.Equal(t, "application/xml; charset=utf-8", w.Header().Get("Content-Type"))
 }
 
+func TestRenderPDF(t *testing.T) {
+	w := httptest.NewRecorder()
+	data := []byte("%Test pdf content")
+
+	pdf := PDF{data}
+
+	pdf.WriteContentType(w)
+	assert.Equal(t, "application/pdf", w.Header().Get("Content-Type"))
+
+	err := pdf.Render(w)
+	require.NoError(t, err)
+
+	assert.Equal(t, data, w.Body.Bytes())
+	assert.Equal(t, "application/pdf", w.Header().Get("Content-Type"))
+}
+
 func TestRenderRedirect(t *testing.T) {
 	req, err := http.NewRequest(http.MethodGet, "/test-redirect", nil)
 	require.NoError(t, err)